Comments

The proportions are also...
The proportions are also quite a bit different. The length of the 3-leg version is typically cited at 270cm and the 2-leg version at 230cm. The cushions on the 3-leg version are also a lot more rectangular, and longer, whereas the 2-leg version has more square cushions.

I would also be curious to know when the 3-leg version was produced, be it earlier or later, or if it was an option that was available all along, for those who wanted a very long sofa.